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<title>CSS作业：css布局</title>
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<link href="styie05.css" rel="stylesheet" type="text/css">
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	<h2>CSS布局作业1</h2>
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		<div class="item3">000003</div>
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	<h2>CSS布局作业2</h2>
<div class="box2">
		<div class="item1">000001</div>
		<div class="item2">000002</div>
		<div class="item3">000003</div>
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	<h2>CSS布局作业3</h2>
	<div class="box3">
		<div class="item1">000001</div>
		<div class="item2">000002</div>
		<div class="item3">000003</div>
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	<h2>CSS布局作业4</h2>
	<div class="box4">
		<div sum><div class="item1">000001</div>
		<div class="item2">000002</div>
		<div class="item3">000003</div></div>
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